A method for voice evaluation having three analysis steps is described. First, the subject is caused to stand with the arms at the sides and produce a yawn-sigh-like sound ("AH") without vibrato for approximately one second. The subject is instructed to begin the sound fairly high on the vocal scale,...http://www.google.com.au/patents/US5988175?utm_source=gb-gplus-sharePatent US5988175 - Method for voice evaluation
